http://avherald.com/h?article=40d379b0

An Air Canada Airbus A319-100, registration C-FYJH performing flight AC949 from Point a Pitre (Guadeloupe) to Montreal,QC (Canada), was ready for takeoff awaiting clearance to takeoff, when the crew received an ECAM Forward Cargo Smoke warning. The fire services were called out, but no heat or smoke was found. The airplane returned to the gate and the cargo unloaded.